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Chapter 15. Security Management | 299
ProSafe M4100 and M7100 Managed Switches
3. Configure the port through which the DHCP server is reached as trusted.
(Netgear Switch) (Config)# interface 1/0/1
(Netgear Switch) (Interface 1/0/1)# ip dhcp snooping trust
4. View the DHCP Snooping Binding table.
(GSM7328S) #show ip dhcp snooping binding
Total number of bindings: 1
MAC Address IP Address VLAN Interface Type Lease (Secs)
----------------- --------------- ---- ----------- ------- -----------
00:16:76:A7:88:CC 192.168.10.86 1 1/0/2 DYNAMIC 86400
5. Enable
ARP inspection in VLAN 1.
(Netgear Switch) (Config)# ip arp inspection vlan 1
Now all ARP packets received on ports that are members of the VLAN are copied to the
CPU for
ARP inspection. If there are trusted ports, you can configure them as trusted in
the next step. ARP packets received on trusted ports are not copied to the CPU.
6. Configure port 1/0/1 as trusted.
(Netgear Switch) (Config)# interface 1/0/1
(Netgear Switch) (Interface 1/0/1)# ip arp inspection trust
Now ARP packets from the DHCP client go through because there is a DHCP snooping
entry; however
ARP packets from the static client are dropped. It can be overcome by static
configuration as described in Static Mapping on page 303.
Web Interface: Configure Dynamic ARP Inspection
1. Enable DHCP snooping globally.
a. Select Security > Control > DHCP Snooping Global Configuration.